CN112831291A

CN112831291A - Packaging adhesive film with lattice structure and preparation method and application thereof

Info

Publication number: CN112831291A
Application number: CN202110012615.6A
Authority: CN
Inventors: 郑亚; 王磊; 韩晓航; 闫烁; 陈洪野; 吴小平
Original assignee: Suzhou Cybrid Application Technology Co ltd
Current assignee: Suzhou Cybrid Application Technology Co ltd
Priority date: 2020-11-05
Filing date: 2021-01-06
Publication date: 2021-05-25
Anticipated expiration: 2041-01-06
Also published as: CN112831291B

Abstract

The invention provides a packaging adhesive film with a lattice structure and a preparation method and application thereof. The packaging adhesive film comprises a transparent adhesive film layer and a reflective film layer with a lattice structure, which are arranged in a superposed manner; the reflective film layer comprises a bonding layer and a supporting layer; the supporting layer is positioned between the transparent adhesive film layer and the bonding layer. The preparation method comprises the following steps: firstly, compounding a bonding layer premix and a supporting layer premix to obtain a composite membrane; then cutting the composite film to obtain a reflective film with a lattice structure; and finally, compounding the reflective film and the transparent film to obtain the packaging adhesive film. The packaging adhesive film provided by the invention can be applied to a photovoltaic module, has a lattice structure, can reflect light leakage among the cell pieces, improves the light utilization rate of the photovoltaic module, and avoids the problems of cell piece slippage and packaging adhesive film deformation when the photovoltaic module is prepared.

Description

Packaging adhesive film with lattice structure and preparation method and application thereof

Technical Field

The invention belongs to the technical field of adhesive films, and particularly relates to a packaging adhesive film with a lattice structure, and a preparation method and application thereof.

Background

With the gradual depletion of traditional fossil energy and the increasing damage to the environment, all countries in the world aim at renewable energy. Solar energy receives more and more attention as a clean, safe, reliable and renewable pollution-free new energy source, the utilization of the solar energy has two modes of photo-thermal conversion and photoelectric conversion, and the most important application of the solar energy is photovoltaic power generation at present. The core part of the photovoltaic power generation is a photovoltaic module, and the photovoltaic module comprises a front plate, an adhesive film, a battery piece, an adhesive film and a back plate which are sequentially stacked. Through development for many years, the conversion efficiency of the cell has been relatively improved to a higher level, and a great part of sunlight in the traditional photovoltaic module directly penetrates through the transparent adhesive film in the gap of the cell, so that great waste of the sunlight is caused.

In the prior art, grid glass is used as a back plate to reflect light leakage between battery pieces so as to increase the power generation power of the photovoltaic module, but the grid glass is far away from the battery pieces, and an adhesive film is close to the battery pieces, so that the adhesive film between the battery pieces and the back plate can be improved, and the conversion efficiency of the photovoltaic module is improved.

CN111403517A discloses an adhesive film for photovoltaic module with a grid-like white ink printed on the surface. This glued membrane includes bottom layer and the latticed white printing ink layer of printing on the bottom surface, the bottom layer is the membrane of two-layer at least coextrusion, and includes: a polyolefin elastomer layer and an ethylene-vinyl acetate copolymer layer facing the white ink layer. The latticed white ink on the surface of the adhesive film provided by the technology just fills the gaps of the battery pieces, and can reflect light rays emitted to the gaps of the battery pieces back to the battery pieces, so that the light ray utilization rate in the assembly is improved, and the power of the assembly is improved. Although the technical scheme improves the light utilization rate of the photovoltaic module by using the adhesive film with the surface printed with the reticular white ink, the volatilization of the auxiliary agent in the white ink needs higher temperature, so that the temperature is higher when the photovoltaic module is prepared by a laminating process, the production cost is higher, and the damage rate of the cell piece can be improved.

CN111403522A discloses a packaging adhesive film with a grid structure and a preparation method thereof. The packaging adhesive film comprises a first packaging adhesive film layer, a transparent layer with a net structure and a second packaging adhesive film layer which are sequentially arranged from top to bottom, and the preparation method comprises the following steps: 1) printing the grid pattern of the grid structure on the transparent layer by adopting a printing technology to obtain the transparent layer with the grid structure; 2) and (2) respectively laminating an adhesive film layer on the upper surface and the lower surface of the transparent layer with the grid structure obtained in the step 1) to obtain the packaging adhesive film. In the packaging adhesive film provided by the technical scheme, the melting point of the transparent adhesive layer is lower, and the transparent adhesive layer is easy to deform when being used for preparing the photovoltaic module and has small influence on the light utilization rate of the photovoltaic module.

CN109536072A discloses a latticed high-reflection double-layer composite structure photovoltaic packaging adhesive film and application thereof. The grid-shaped high-reflection double-layer composite photovoltaic packaging adhesive film is composed of a grid-shaped high-reflection layer and a transparent adhesive film, and the shape of the grid-shaped high-reflection layer corresponds to an area, not covered by a battery piece, in the photovoltaic assembly. The packaging adhesive film provided by the technical scheme has a two-layer structure, namely, a grid-shaped high-reflection layer; and the latticed high-reflection layer is compounded on the transparent adhesive film in ink-jet printing, gravure printing, 3D printing and other modes. However, because the melting temperature of the resin for preparing the high-reflection layer and the transparent adhesive layer is low, when the photovoltaic module is prepared by a laminating process, the matrix resin of the adhesive film can melt and flow, so that grid deformation is caused, and the light utilization rate of the photovoltaic module cannot be greatly improved.

Therefore, how to provide a packaging adhesive film which can improve the utilization rate of the photovoltaic module to sunlight and has a simple preparation method has become an urgent problem to be solved.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a packaging adhesive film with a lattice structure and a preparation method and application thereof. The packaging adhesive film provided by the invention has a lattice structure, can reflect light leakage among the battery pieces, improves the light utilization rate of the photovoltaic module, and can stick the battery pieces when preparing the photovoltaic module so as to prevent the battery pieces from slipping; the supporting layer has certain mechanical strength, can prevent the packaging adhesive film from deforming, and is convenient for the preparation of the packaging adhesive film.

In order to achieve the purpose, the invention adopts the following technical scheme:

in a first aspect, the invention provides a packaging adhesive film with a lattice structure, which comprises a transparent adhesive film layer and a reflective film layer, wherein the transparent adhesive film layer and the reflective film layer are arranged in a stacked manner;

the reflective film layer comprises a bonding layer and a supporting layer;

the supporting layer is positioned between the transparent adhesive film layer and the bonding layer.

The packaging adhesive film provided by the invention has a multilayer structure, wherein the reflecting film layer comprises a bonding layer and a supporting layer, the bonding layer has certain viscosity, and one surface of the bonding layer is attached to a cell piece when a photovoltaic module is prepared, so that the cell piece can be bonded to prevent the cell piece from slipping in the process of preparing the photovoltaic module by a laminating process; the supporting layer has certain mechanical strength, and at the in-process of preparation photovoltaic module, prevent that the encapsulation glued membrane from taking place deformation, be convenient for simultaneously tailor into the shape that has lattice structure with the rete that reflects light, prevent to appear tailorring the emergence of being uneven or having burr scheduling problem.

The following is a preferred technical solution of the present invention, but not a limitation to the technical solution provided by the present invention, and the object and advantageous effects of the present invention can be better achieved and achieved by the following preferred technical solution.

As a preferred embodiment of the present invention, the material of the transparent adhesive film layer is selected from any one or a combination of at least two of ethylene-vinyl acetate copolymer, ethylene- α -olefin copolymer, ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, ethylene-methyl methacrylate copolymer, ethyl-methacrylate copolymer, ethylene-butyl acrylate copolymer, polyvinyl butyral, ionomer, and polyurethane.

Preferably, the bonding layer comprises a first substrate.

Preferably, the first substrate has a melting temperature of 60 to 240 ℃, for example, 60 ℃, 80 ℃, 100 ℃, 120 ℃, 140 ℃, 160 ℃, 180 ℃, 200 ℃, 220 ℃ or 240 ℃.

Preferably, the first matrix is selected from any one of polyethylene, ethylene-alpha-olefin copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, ethylene-methyl methacrylate copolymer, ethyl-methacrylate copolymer, ethylene-butyl acrylate copolymer, nylon or ionomer or a combination of at least two thereof.

Preferably, the weight part of the first substrate in the bonding layer is 50 to 100 parts, for example, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, 80 parts, 85 parts, 90 parts, 95 parts or 100 parts.

According to the invention, a material with a lower melting temperature is selected as the first substrate of the bonding layer, the weight part of the first substrate in the bonding layer is further controlled within a specific range, and when the photovoltaic module is prepared by a laminating process, the first substrate material of the bonding layer is partially melted to stick the cell, so that the cell can be effectively prevented from slipping.

Preferably, a tackifying resin is also included in the tie layer.

Preferably, the tackifying resin is selected from any one of rosin compounds, alpha-terpene resins, beta-terpene resins, terpene phenolic resins, petroleum resins, dicyclopentadiene resins, coumarone-indene resins, alkyl phenolic resins or xylene resins or a combination of at least two thereof.

Preferably, the rosin compound comprises any one of gum rosin, wood rosin, hydrogenated rosin, polymerized rosin, esterified rosin resin and maleic rosin or a combination of at least two of the foregoing.

Preferably, the weight part of the tackifying resin in the adhesive layer is 0.5-50 parts, and may be, for example, 0.5 part, 1 part, 5 parts, 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, or the like.

Preferably, the adhesive layer further comprises a filler.

Preferably, the filler is selected from any one of titanium dioxide, silicon dioxide, zirconium dioxide, zinc oxide, lithopone, calcium carbonate, barium sulfate, carbon black, chrome yellow, iron red, chromium oxide green or iron blue or a combination of at least two of the above.

Preferably, the weight part of the filler in the bonding layer is 0.1-20 parts, such as 0.1 part, 0.2 part, 0.5 part, 1 part, 2 parts, 4 parts, 6 parts, 8 parts, 10 parts, 12 parts, 14 parts, 16 parts, 18 parts or 20 parts.

As a preferred embodiment of the present invention, the adhesive layer further includes an auxiliary.

Preferably, the weight part of the auxiliary agent in the bonding layer is 0.01-5 parts, such as 0.01 part, 0.02 part, 0.05 part, 0.1 part, 0.2 part, 0.5 part, 1 part, 1.3 part, 1.5 part, 1.8 part, 2.1 part, 2.5 part, 3 parts, 3.4 parts, 3.8 parts, 4.2 parts, 4.6 parts or 5 parts.

Preferably, the auxiliary agent comprises any one of a crosslinking agent, an auxiliary crosslinking agent, a silane coupling agent, a light stabilizer, an antioxidant, an ultraviolet light absorber or an anti-PID auxiliary agent or a combination of at least two of the above.

Preferably, the crosslinking agent is selected from any one of tert-butyl peroxy-2-ethylhexyl carbonate, tert-amyl peroxy (2-ethylhexyl) carbonate, 2, 5-dimethyl-2, 5-bis (tert-butylperoxy) hexane, tert-butyl peroxy-3, 5, 5-trimethylhexanoate, bis (4-methylbenzoyl) peroxide, dibenzoyl peroxide, 1-di (tert-butylperoxy) cyclohexane, 2-ethylhexyl tert-butylperoxycarbonate, butyl-4, 4-bis (tert-butylperoxy) valerate, dicumyl peroxide, or 1, 1-bis (tert-butylperoxy) -3,3, 5-trimethylcyclohexane, or a combination of at least two thereof.

Preferably, the weight part of the cross-linking agent in the bonding layer is 0.5-1.5 parts, such as 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part, 1 part, 1.1 part, 1.2 parts, 1.3 parts, 1.4 parts or 1.5 parts.

Preferably, the auxiliary crosslinking agent is selected from any one of triallyl isocyanurate, triallyl cyanurate, trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate or ethoxylated pentaerythritol tetraacrylate, or a combination of at least two thereof.

Preferably, the weight part of the auxiliary crosslinking agent in the bonding layer is 0.5-1.5 parts, such as 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part, 1 part, 1.1 part, 1.2 parts, 1.3 parts, 1.4 parts or 1.5 parts.

Preferably, the silane coupling agent is selected from any one of or a combination of at least two of vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (β -methoxyethoxy) silane, N- (2-aminoethyl-3-aminopropyl) trimethoxysilane, 3- (2, 3-glycidoxy) propylmethyldiethoxysilane, 3- (methacryloyl chloride) propyltrimethoxysilane, methacryloxypropyltrimethoxysilane or γ -methacryloxypropyltrimethoxysilane.

Preferably, the silane coupling agent in the adhesive layer is 0.1-1 part by weight, and may be, for example, 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part or 1 part.

Preferably, the light stabilizer is selected from any one of carbon black, titanium oxide, phthalocyanine blue, phthalocyanine green, UV-123, UV-292, UV-622, UV-770 or UV-944 or a combination of at least two of the above.

Preferably, the light stabilizer in the bonding layer is 0.01 to 0.5 parts by weight, and may be, for example, 0.01 part, 0.02 part, 0.05 part, 0.08 part, 0.1 part, 0.15 part, 0.2 part, 0.25 part, 0.3 part, 0.35 part, 0.4 part, 0.45 part, 0.5 part, or the like.

Preferably, the antioxidant is selected from any one or a combination of at least two of 2, 6-di-tert-butyl-4-methylphenol, an antioxidant lU1U, an antioxidant 1098, an antioxidant 1010, an antioxidant 1076, an antioxidant MD-1024, an antioxidant MD-697, an antioxidant 1098, an antioxidant 3114, an antioxidant 245, an antioxidant 1520, an antioxidant 1726, an antioxidant 1035, an antioxidant 1135, an antioxidant 5057, an antioxidant 330 and an antioxidant 1790.

Preferably, the antioxidant is present in the tie layer in an amount of 0.01 to 0.5 parts by weight, and may be, for example, 0.01 parts, 0.02 parts, 0.05 parts, 0.08 parts, 0.1 parts, 0.15 parts, 0.2 parts, 0.25 parts, 0.3 parts, 0.35 parts, 0.4 parts, 0.45 parts, or 0.5 parts, etc.

Preferably, the ultraviolet light absorber is selected from any one or a combination of at least two of UV-326, UV-327, UV-328, UV-329, UV-360, UV-P, UV-234, UV-1130, UV-384-2, UV-928, UV-400, UV-1577, UV-1164 or UV-531.

Preferably, the weight part of the ultraviolet absorber in the adhesive layer is 0.01 to 0.5 part, and may be, for example, 0.01 part, 0.02 part, 0.05 part, 0.08 part, 0.1 part, 0.15 part, 0.2 part, 0.25 part, 0.3 part, 0.35 part, 0.4 part, 0.45 part, 0.5 part, or the like.

Preferably, the anti-PID additive is selected from metal phosphates and/or silica.

Preferably, the metal phosphate is selected from zirconium phosphate and/or titanium phosphate.

Preferably, the anti-PID additive in the adhesive layer is 0.1 to 0.5 parts by weight, such as 0.1 part, 0.12 part, 0.15 part, 0.18 part, 0.2 part, 0.23 part, 0.27 part, 0.3 part, 0.33 part, 0.35 part, 0.38 part, 0.4 part, 0.42 part, 0.45 part, 0.47 part or 0.5 part.

As a preferred embodiment of the present invention, the support layer includes a second base.

Preferably, the second substrate has a melting temperature of 70 to 300 ℃, for example, 70 ℃, 80 ℃, 100 ℃, 120 ℃, 140 ℃, 160 ℃, 180 ℃, 200 ℃, 220 ℃, 240 ℃, 260 ℃, 280 ℃ or 300 ℃.

Preferably, the second matrix is selected from any one of or a combination of at least two of ethylene-vinyl acetate copolymer, ethylene-alpha-olefin copolymer, polypropylene, polyethylene, polyester, nylon-polyolefin graft copolymer, ethylene-propylene copolymer, polyvinylidene fluoride, or silicone resin.

Preferably, the weight part of the second substrate in the support layer is 75-100 parts, such as 75 parts, 78 parts, 80 parts, 82 parts, 85 parts, 88 parts, 90 parts, 93 parts, 95 parts, 97 parts or 100 parts.

According to the invention, a material with a higher melting temperature is selected as the second substrate of the supporting layer, so that the packaging adhesive film with the lattice structure has better mechanical strength and is convenient to cut; on the other hand, when the material with higher melting temperature is used for preparing the photovoltaic module, the material cannot deform so as to prevent the cell piece and the partially melted bonding layer from slipping.

Preferably, the support layer further comprises a filler.

Preferably, the weight part of the filler in the support layer is 0.1 to 20 parts, and may be, for example, 0.1 part, 0.2 part, 0.5 part, 1 part, 2 parts, 4 parts, 6 parts, 8 parts, 10 parts, 12 parts, 14 parts, 16 parts, 18 parts, 20 parts, or the like.

As a preferred technical solution of the present invention, the support layer further comprises an auxiliary agent.

Preferably, the weight part of the auxiliary agent in the support layer is 0.01 to 4.5 parts, such as 0.01 part, 0.02 part, 0.05 part, 0.1 part, 0.2 part, 0.5 part, 1 part, 1.3 part, 1.5 part, 1.8 part, 2.1 part, 2.5 parts, 3 parts, 3.4 parts, 3.8 parts, 4.2 parts, 4.5 parts and the like.

Preferably, the crosslinking agent is selected from the group consisting of tert-butyl peroxy-2-ethylhexyl carbonate, tert-amyl peroxy-2-ethylhexyl carbonate, 2, 5-dimethyl-2, 5-bis (tert-butylperoxy) hexane, tert-butyl peroxy-3, 5, 5-trimethylhexanoate, bis (4-methylbenzoyl) peroxide, dibenzoyl peroxide, 1-bis (tert-butylperoxy) cyclohexane, 2-ethylhexyl tert-butylperoxycarbonate, butyl-4, 4-bis (tert-butylperoxy) valerate, dicumyl peroxide, alpha, any one of or a combination of at least two of α' -bis (t-butylperoxy) -1, 3-diisopropylbenzene or 1, 1-bis (t-butylperoxy) -3,3, 5-trimethylcyclohexane.

Preferably, the weight part of the cross-linking agent in the support layer is 0.1-1 part, such as 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part or 1 part.

Preferably, the weight part of the auxiliary crosslinking agent in the support layer is 0.1-1 part, and may be, for example, 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part or 1 part.

Preferably, the weight part of the silane coupling agent in the support layer is 0.1-1 part, and may be, for example, 0.1 part, 0.2 part, 0.3 part, 0.4 part, 0.5 part, 0.6 part, 0.7 part, 0.8 part, 0.9 part or 1 part.

Preferably, the light stabilizer in the support layer is 0.01 to 0.5 parts by weight, such as 0.01 part, 0.05 part, 0.1 part, 0.15 part, 0.2 part, 0.25 part, 0.3 part, 0.35 part, 0.4 part, 0.45 part or 0.5 part.

Preferably, the antioxidant in the support layer is selected from any one or a combination of at least two of 2, 6-di-tert-butyl-4-methylphenol, antioxidant lU1U, antioxidant 1098, antioxidant 1010, antioxidant 1076, antioxidant MD-1024, antioxidant MD-697, antioxidant 1098, antioxidant 3114, antioxidant 245, antioxidant 1520, antioxidant 1726, antioxidant 1035, antioxidant 1135, antioxidant 5057, antioxidant 330 and antioxidant 1790.

Preferably, the part by weight of the antioxidant in the support layer is 0.01 to 0.5 parts, and may be, for example, 0.01 parts, 0.05 parts, 0.1 parts, 0.15 parts, 0.2 parts, 0.25 parts, 0.3 parts, 0.35 parts, 0.4 parts, 0.45 parts, 0.5 parts, or the like.

Preferably, the weight part of the ultraviolet light absorber in the support layer is 0.01-0.5 parts, such as 0.01 parts, 0.05 parts, 0.1 parts, 0.15 parts, 0.2 parts, 0.25 parts, 0.3 parts, 0.35 parts, 0.4 parts, 0.45 parts or 0.5 parts.

Preferably, the part by weight of the anti-PID additive in the support layer is 0.01 to 0.5 part, and may be, for example, 0.01 part, 0.05 part, 0.1 part, 0.15 part, 0.2 part, 0.25 part, 0.3 part, 0.35 part, 0.4 part, 0.45 part or 0.5 part, etc.

In a preferred embodiment of the present invention, the thickness of the transparent adhesive film layer is 200 to 1000. mu.m, and may be, for example, 200. mu.m, 250. mu.m, 300. mu.m, 350. mu.m, 400. mu.m, 450. mu.m, 500. mu.m, 550. mu.m, 600. mu.m, 650. mu.m, 700. mu.m, 750. mu.m, 800. mu.m, 850. mu.m, 900. mu.m, 950. mu.m, or 1000. mu.m.

The adhesive layer preferably has a thickness of 20 to 50 μm, and may be, for example, 20 μm, 22 μm, 25 μm, 28 μm, 30 μm, 33 μm, 35 μm, 37 μm, 40 μm, 42 μm, 45 μm, 47 μm, or 50 μm.

Preferably, the thickness of the support layer is 20 to 50 μm, and may be, for example, 20 μm, 23 μm, 26 μm, 28 μm, 30 μm, 32 μm, 35 μm, 38 μm, 40 μm, 43 μm, 46 μm, 48 μm, or 50 μm.

In the invention, the bonding layer and the supporting layer with certain thickness are selected, so that the packaging adhesive film with the lattice structure has better bonding force and better mechanical property, and is convenient to prepare. If the thickness of the bonding layer is too small, the bonding force of the packaging adhesive film is small, and the packaging adhesive film is not suitable for use; if the thickness of the adhesive layer is too large, the battery piece is easy to crack; if the thickness of the supporting layer is too small, the packaging adhesive film is easy to deform; if the thickness of the support layer is too large, the reflective film protrudes too much, which easily leads to electrical cell cracking in the photovoltaic module.

As a preferred technical scheme of the invention, the lattice structure of the reflective film layer is a rectangular lattice structure and/or a grid lattice structure.

Preferably, the width of the rectangle in the rectangular lattice structure is 0.3-2 cm, and may be, for example, 0.3cm, 0.5cm, 0.8cm, 1cm, 1.2cm, 1.5cm, 1.7cm, 2cm, or the like.

Preferably, the distance between adjacent rectangles in the rectangular lattice structure is 10-30 cm, such as 10cm, 12cm, 14cm, 16cm, 18cm, 20cm, 22cm, 24cm, 26cm, 28cm or 30 cm.

Preferably, the lattice structure is composed of quadrangular unit cells.

Preferably, the width of the quadrilateral unit cell is 10-30 cm, for example, 10cm, 12cm, 14cm, 16cm, 18cm, 20cm, 22cm, 24cm, 26cm, 28cm or 30cm, etc.

Preferably, the length of the quadrilateral unit cell is 10-30 cm, for example, 10cm, 12cm, 14cm, 16cm, 18cm, 20cm, 22cm, 24cm, 26cm, 28cm or 30cm, etc.

Preferably, the distance between adjacent quadrilateral unit cells is 0.3-2 cm, such as 0.3cm, 0.5cm, 0.8cm, 1cm, 1.2cm, 1.5cm, 1.7cm or 2 cm.

In a second aspect, the present invention provides a method for preparing the packaging adhesive film according to the first aspect, including the following steps:

(1) compounding the bonding layer premix and the supporting layer premix to obtain a composite membrane;

(2) cutting the composite film obtained in the step (1) to obtain a reflective film with a lattice structure;

(3) and (3) compounding the reflective film obtained in the step (2) with a transparent film to obtain the packaging adhesive film.

Before the step (1), the preparation method further comprises the step of mixing the components of the bonding layer to obtain a bonding layer premix; similarly, before the step (1), the preparation method further comprises the step of mixing the components of the support layer to obtain the support layer premix.

As a preferred technical scheme of the invention, the compounding method in the step (1) is extrusion by a double-layer co-extrusion extruder.

Preferably, the extruding temperature of the double-layer co-extrusion extruder is 50-250 ℃, for example, 50 ℃, 70 ℃, 90 ℃, 110 ℃, 130 ℃, 150 ℃, 170 ℃, 190 ℃, 210 ℃, 230 ℃ or 250 ℃ and the like.

In the present invention, the extrusion temperature of the adhesive layer premix is 50 to 110 ℃ (for example, 50 ℃, 55 ℃, 60 ℃, 65 ℃, 70 ℃, 75 ℃, 80 ℃, 85 ℃, 90 ℃, 95 ℃, 100 ℃, 105 ℃ or 50 ℃ and the like), and the extrusion temperature of the support layer premix is 110 to 250 ℃ (for example, 110 ℃, 120 ℃, 130 ℃, 140 ℃, 150 ℃, 160 ℃, 170 ℃, 180 ℃, 190 ℃, 200 ℃, 210 ℃, 220 ℃, 230 ℃, 240 ℃ or 250 ℃ and the like).

Preferably, the temperature for the compounding in the step (3) is 40 to 80 ℃, and may be, for example, 40 ℃, 43 ℃, 46 ℃, 50 ℃, 55 ℃, 58 ℃, 60 ℃, 62 ℃, 64 ℃, 67 ℃, 70 ℃, 73 ℃, 77 ℃ or 80 ℃.

Preferably, the compounding time in step (3) is 0.1-10 s, for example, 0.1s, 0.2s, 0.5s, 1s, 0.5s, 2s, 2.8s, 3.6s, 4.9s, 5.7s, 6.4s, 7s, 7.8s, 8.6s, 9.2s, or 10 s.

In a third aspect, the present invention provides a use of the encapsulant film of the first aspect, wherein the encapsulant film is used in a photovoltaic module.

Compared with the prior art, the invention has the following beneficial effects:

(1) according to the invention, through the design of the packaging adhesive film structure, the reflective film layer of the packaging adhesive film has a lattice structure and has a high reflectivity of 80-94%, light leakage among battery pieces can be reflected, the light utilization rate of the photovoltaic module is improved, the power generation power of the photovoltaic module is further improved, and the power generation power gain of the photovoltaic module is 0.51-1.22%.

(2) The invention makes the adhesive layer have certain cohesiveness and the supporting layer has certain mechanical strength by designing the components of the adhesive layer and the supporting layer. When the photovoltaic module is prepared, the packaging adhesive film provided by the invention can stick the battery piece, so that the battery piece is prevented from sliding, the battery piece is not easy to deform, and meanwhile, the preparation of the packaging adhesive film is convenient.

Drawings

FIG. 1 is a schematic top view of a packaging film with a lattice structure according to the present invention;

FIG. 2 is a schematic top view of a packaging film with a rectangular lattice structure according to the present invention;

FIG. 3 is a schematic cross-sectional view of a packaging adhesive film with a lattice structure according to the present invention;

wherein, the film comprises 1-a light-transmitting film layer, 2-a light-reflecting film layer, 21-an adhesive layer and 22-a supporting layer.

Detailed Description

The technical scheme of the invention is further explained by the specific embodiment in combination with the attached drawings. It should be understood by those skilled in the art that the embodiments are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.

The sources of some of the components in the examples and comparative examples are as follows:

ethylene-vinyl acetate copolymer: korean group, E282 PV;

polyethylene: shandong Xinyu New Material science and technology Co., Ltd;

polypropylene: taiwan tai plastic group, china, 3084H;

dicyclopentadiene resin: shandong Qilong chemical Co., Ltd;

polyvinylidene fluoride: suzhou Saiwu applied technology, Inc.;

ethylene- α -olefin copolymer: dow, usa, 8660;

rosin: shanghai Chuangzhen chemical Co., Ltd;

polyvinylidene fluoride: acalma, france;

polyvinyl butyral: taiwan vinpoch group, PVB B03 HX;

ethylene-butyl acrylate copolymer: arkema, france, 35BA 40T;

α -terpene resin: shanghai Judo chemical Co., Ltd;

silicone resin: belief KR-251;

ethylene-acrylic acid copolymer: dow, PRIMACOR 1410, usa;

nylon-polyolefin graft copolymer: acalma, APOLHYA LC3UV, france;

petroleum resin: arakawa chemical group, P-125.

Example 1

The embodiment provides a packaging adhesive film with a grid lattice structure and a preparation method thereof, wherein a schematic view of a top-down structure of the packaging adhesive film is shown in fig. 1, a schematic view of a cross-sectional structure of the packaging adhesive film is shown in fig. 3, and the packaging adhesive film comprises a transparent adhesive film layer 1 and a reflective film layer 2 with a grid lattice structure, which are arranged in an overlapping manner;

the reflecting film layer 2 comprises an adhesive layer 21 and a supporting layer 22;

wherein, the thickness of the transparent adhesive film layer 1 is 400 μm, the thickness of the adhesive layer 21 is 30 μm, and the thickness of the support layer 22 is 20 μm; the grid lattice structure is composed of quadrilateral unit cells, the width of each quadrilateral unit cell is 20cm, the length of each quadrilateral unit cell is 20cm, and the distance between every two adjacent quadrilateral unit cells is 1 cm.

The transparent adhesive film layer 1 is made of ethylene-vinyl acetate copolymer; the bonding layer 21 comprises the following components in parts by weight: 80 parts of polyethylene, 20 parts of dicyclopentadiene resin, 5 parts of titanium dioxide, 1 part of tert-butyl peroxy-2-ethylhexyl carbonate, 1 part of triallyl cyanurate, 0.5 part of gamma-methacryloxypropyl trimethoxy silane, 0.8978 part of UV-7700.2 part of antioxidant 10100.3 part of UV-5310.25 part of zirconium phosphate; the supporting layer 22 comprises the following components in parts by weight: 80 parts of polyvinylidene fluoride, 8 parts of silicon dioxide, 0.7 part of tert-butyl peroxy-2-ethylhexyl carbonate, 0.8 part of triallyl isocyanurate, 0.7 part of vinyl trimethoxy silane, UV-1230.2 parts, 10100.3 parts of antioxidant, UV-3260.25 parts and 0.25 part of zirconium phosphate.

The preparation method of the packaging adhesive film comprises the following steps:

(1) mixing the components of the bonding layer 21 for 30min at 30 ℃ to obtain bonding layer 21 premix; mixing the components of the supporting layer 22 for 30min at 30 ℃ to obtain a supporting layer 22 premix;

(2) extruding the bonding layer 21 premix and the supporting layer 22 premix obtained in the step (1) through a double-layer co-extrusion extruder to obtain a composite film; the extrusion temperature of the premix of the bonding layer 21 is 70 ℃, and the extrusion temperature of the premix of the support layer 22 is 200 ℃;

(3) cutting the composite film obtained in the step (2) to obtain a reflective film with a grid lattice structure;

(4) and (3) compounding the reflective film obtained in the step (3) with a transparent film for 5s at 50 ℃ to obtain the packaging adhesive film.

Example 2

The embodiment provides a packaging adhesive film with a rectangular lattice structure and a preparation method thereof, wherein a schematic view of a top-down structure of the packaging adhesive film is shown in fig. 2, a schematic view of a cross-sectional structure of the packaging adhesive film is shown in fig. 3, and the packaging adhesive film comprises a transparent adhesive film layer 1 and a reflective film layer 2, which are arranged in a stacked manner, wherein the reflective film layer has a rectangular lattice structure;

wherein, the thickness of the transparent adhesive film layer 1 is 600 μm, the thickness of the adhesive layer 21 is 20 μm, and the thickness of the support layer 22 is 30 μm; the width of the rectangle in the rectangular dot matrix is 1cm, and the distance between adjacent rectangles is 20 cm.

The transparent adhesive film layer 1 is made of ethylene-alpha-olefin copolymer; the bonding layer 21 comprises the following components in parts by weight: 70 parts of ethylene-alpha-olefin copolymer, 40 parts of rosin, 10 parts of silicon dioxide, 0.8 part of tert-amyl peroxy (2-ethylhexyl) carbonate, 0.7 part of trimethylolpropane triacrylate, 1 part of vinyltriethoxysilane, 0.1 part of titanium oxide, 0.01 part of 2, 6-di-tert-butyl-4-methylphenol, 0.25 part of UV-3270.5 and 0.25 part of titanium phosphate; the supporting layer 22 comprises the following components in parts by weight: 75 parts of polyvinylidene fluoride, 10 parts of silicon dioxide, 0.5 part of 2, 5-dimethyl-2, 5-bis (tert-butylperoxy) hexane, 0.4 part of triallyl cyanurate, 0.1 part of vinyl tri (beta-methoxyethoxy) silane, UV-6220.01 parts, 17900.1 parts of antioxidant, UV-3290.01 parts and 0.5 part of titanium phosphate.

(1) mixing the components of the bonding layer 21 for 30min at 40 ℃ to obtain bonding layer 21 premix; mixing the components of the supporting layer 22 for 30min at 40 ℃ to obtain a supporting layer 22 premix;

(2) extruding the bonding layer 21 premix and the supporting layer 22 premix through a double-layer co-extrusion extruder to obtain a composite film; the extrusion temperature of the premix of the bonding layer 21 is 80 ℃, and the extrusion temperature of the premix of the support layer 22 is 180 ℃;

(3) cutting the composite film obtained in the step (2) to obtain a reflective film with a rectangular lattice structure;

(4) and (3) compounding the reflective film obtained in the step (3) with a transparent film for 0.1s at the temperature of 60 ℃ to obtain the packaging adhesive film.

Example 3

wherein, the thickness of the transparent adhesive film layer 1 is 600 μm, the thickness of the adhesive layer 21 is 35 μm, and the thickness of the support layer 22 is 25 μm; the grid lattice structure is composed of quadrilateral unit cells, the width of each quadrilateral unit cell is 10cm, the length of each quadrilateral unit cell is 10cm, and the distance between every two adjacent quadrilateral unit cells is 0.3 cm.

The transparent adhesive film layer 1 is made of polyvinyl butyral; the bonding layer 21 comprises the following components in parts by weight: 90 parts of ethylene-butyl acrylate copolymer, 10 parts of alpha-terpene resin, 20 parts of lithopone, 1.5 parts of bis (4-methylbenzoyl) peroxide, 1.5 parts of triallyl isocyanurate, 0.8 part of 3- (methacryloyl chloride) propyltrimethoxysilane, 0.5 part of phthalocyanine blue, 10980.2 parts of antioxidant and 0.5 part of silicon dioxide; the supporting layer 22 comprises the following components in parts by weight: 30 parts of silicon resin, 55 parts of polypropylene, 20 parts of lithopone, 1 part of tert-butyl peroxy-3, 5, 5-trimethylhexanoate, 1 part of ethoxylated trimethylolpropane triacrylate, 1 part of 3- (2, 3-epoxypropoxy) propylmethyldiethoxysilane, UV-9440.5 parts, 2450.0.5 parts of antioxidant, UV-4000.2 parts and 0.3 part of silicon dioxide.

(1) mixing the components of the bonding layer 21 for 40min at 50 ℃ to obtain bonding layer 21 premix; mixing the components of the supporting layer 22 for 50min at 50 ℃ to obtain a supporting layer 22 premix;

(2) extruding the bonding layer 21 premix and the supporting layer 22 premix obtained in the step (1) through a double-layer co-extrusion extruder to obtain a composite film; the extrusion temperature of the premix of the bonding layer 21 is 85 ℃, and the extrusion temperature of the premix of the support layer 22 is 150 ℃;

(4) and (3) compounding the reflective film obtained in the step (3) with a transparent film for 2s at 40 ℃ to obtain the packaging adhesive film.

Example 4

wherein, the thickness of the transparent adhesive film layer 1 is 500 μm, the thickness of the bonding layer 21 is 50 μm, and the thickness of the supporting layer 22 is 50 μm; the grid lattice structure is composed of quadrilateral unit cells, the width of each quadrilateral unit cell is 30cm, the length of each quadrilateral unit cell is 20cm, and the distance between every two adjacent quadrilateral unit cells is 2 cm.

The transparent adhesive film layer 1 is made of ethylene-acrylic acid copolymer; the bonding layer 21 comprises the following components in parts by weight: 60 parts of ethylene-acrylic acid copolymer, 35 parts of alpha-terpene resin, 0.5 part of carbon black, 1.2 parts of dibenzoyl peroxide, 0.5 part of ethoxylated pentaerythritol tetraacrylate, 0.1 part of vinyl tri (beta-methoxyethoxy) silane, UV-9440.25 parts, 15200.5 parts of antioxidant, UV-11640.01 parts and 0.2 part of zirconium phosphate; the supporting layer 22 comprises the following components in parts by weight: 50 parts of ethylene-vinyl acetate copolymer, 40 parts of polypropylene, 15 parts of iron oxide red, 0.1 part of di (4-methylbenzoyl) peroxide, 0.1 part of triallyl cyanurate, 0.5 part of N- (2-aminoethyl-3-aminopropyl) trimethoxy silane, UV-7700.25 parts, 17260.01 parts of antioxidant, UV-2340.5 parts and 0.01 part of titanium phosphate.

(1) mixing the components of the bonding layer 21 for 40min at 25 ℃ to obtain bonding layer 21 premix; mixing the components of the supporting layer 22 for 30min at 30 ℃ to obtain a supporting layer 22 premix;

(2) extruding the bonding layer 21 premix and the supporting layer 22 premix obtained in the step (1) through a double-layer co-extrusion extruder to obtain a composite film; the extrusion temperature of the premix of the bonding layer 21 is 90 ℃, and the extrusion temperature of the premix of the support layer 22 is 190 ℃;

(4) and (4) compounding the reflective film obtained in the step (3) with a transparent film for 8s at 80 ℃ to obtain the packaging adhesive film.

Example 5

The embodiment provides a packaging adhesive film with a rectangular lattice structure and a preparation method thereof, wherein a schematic view of a top-down structure is shown in fig. 2, a schematic view of a cross-sectional structure is shown in fig. 3, and the packaging adhesive film comprises a transparent adhesive film layer 1 and a reflective film layer 2 which are arranged in a stacked manner, wherein the reflective film layer has a rectangular lattice structure;

wherein, the thickness of the transparent adhesive film layer 1 is 1000 μm, the thickness of the adhesive layer 21 is 30 μm, and the thickness of the support layer 22 is 30 μm; the width of the rectangle in the rectangular lattice is 0.3cm, and the distance between adjacent rectangles is 30 cm.

The transparent adhesive film layer 1 is made of ethylene-vinyl acetate copolymer; the bonding layer 21 comprises the following components in parts by weight: 85 parts of polyethylene, 0.5 part of petroleum resin, 0.1 part of zinc oxide and UV-6220.01 parts; the supporting layer 22 comprises the following components in parts by weight: 95 parts of nylon-polyolefin graft copolymer, 20 parts of calcium carbonate and 78 parts of UV-11640.01 parts.

(1) mixing the components of the bonding layer 21 for 25min at 35 ℃ to obtain bonding layer 21 premix; mixing the components of the supporting layer 22 for 30min at 30 ℃ to obtain a supporting layer 22 premix;

(2) extruding the bonding layer 21 premix and the supporting layer 22 premix through a double-layer co-extrusion extruder to obtain a composite film; the extrusion temperature of the premix of the bonding layer 21 is 75 ℃, and the extrusion temperature of the premix of the support layer 22 is 180 ℃;

(4) and (3) compounding the reflective film obtained in the step (3) with a transparent film for 10s at 65 ℃ to obtain the packaging adhesive film.

Example 6

wherein, the thickness of the transparent adhesive film layer 1 is 400 μm, the thickness of the bonding layer 21 is 35 μm, and the thickness of the supporting layer 22 is 25 μm; the width of the rectangle in the rectangular dot matrix is 2cm, and the distance between adjacent rectangles is 10 cm.

The transparent adhesive film layer 1 is made of ethylene-vinyl acetate copolymer; the bonding layer 21 comprises the following components in parts by weight: 98.5 parts of ethylene-acrylic acid copolymer, 0.5 part of 2, 5-dimethyl-2, 5-bis (tert-butylperoxy) hexane, 0.5 part of triallyl cyanurate, 0.2 part of methyl alanine propylene oxypropyl trimethoxy silane, UV-7700.2 parts and UV-5310.1 parts; the supporting layer 22 comprises the following components in parts by weight: 99.9 parts of polyvinylidene fluoride and 0.1 part of silicon dioxide.

(1) mixing the components of the bonding layer 21 for 30min at 30 ℃ to obtain bonding layer 21 premix; mixing the components of the supporting layer 22 for 30min at 25 ℃ to obtain a supporting layer 22 premix;

(2) extruding the bonding layer 21 premix and the supporting layer 22 premix through a double-layer co-extrusion extruder to obtain a composite film; the extrusion temperature of the premix of the bonding layer 21 is 90 ℃, and the extrusion temperature of the premix of the support layer 22 is 220 ℃;

(4) and (4) compounding the reflective film obtained in the step (3) with a transparent film for 5s at 40 ℃ to obtain the packaging adhesive film.

Example 7

wherein the thickness of the transparent adhesive film layer 1 is 300 μm, the thickness of the adhesive layer 21 is 20 μm, and the thickness of the support layer 22 is 30 μm; the width of the rectangle in the rectangular dot matrix is 1cm, and the distance between adjacent rectangles is 14 cm.

The transparent adhesive film layer 1 is made of ethylene-vinyl acetate copolymer; the bonding layer 21 comprises the following components in parts by weight: 50 parts of ethylene-vinyl acetate copolymer and 50 parts of petroleum resin, wherein the supporting layer 22 comprises the following components in parts by weight: 99 parts of polyethylene, UV-7700.5 parts, 10100.25 parts of antioxidant and 0.25 part of titanium phosphate.

(1) mixing the components of the bonding layer 21 for 30min at 20 ℃ to obtain bonding layer 21 premix; mixing the components of the supporting layer 22 for 20min at 25 ℃ to obtain a supporting layer 22 premix;

(2) extruding the bonding layer 21 premix and the supporting layer 22 premix through a double-layer co-extrusion extruder to obtain a composite film; the extrusion temperature of the premix of the bonding layer 21 is 85 ℃, and the extrusion temperature of the premix of the support layer 22 is 170 ℃;

Example 8

wherein, the thickness of the transparent adhesive film layer 1 is 200 μm, the thickness of the adhesive layer 21 is 30 μm, and the thickness of the supporting layer 22 is 20 μm; the grid lattice structure is composed of quadrilateral unit cells, the width of each quadrilateral unit cell is 14cm, the length of each quadrilateral unit cell is 14.5cm, and the distance between every two adjacent quadrilateral unit cells is 1 cm.

The transparent adhesive film layer 1 is made of ethylene-alpha-olefin copolymer; the material of the bonding layer 21 is ethylene-alpha-olefin copolymer; the material of the support layer 22 is polypropylene.

In this embodiment, the preparation method of the packaging adhesive film with the lattice structure comprises the following steps:

(1) extruding the ethylene-alpha-olefin copolymer and the polypropylene by a double-layer co-extrusion extruder to obtain a composite film; the extrusion temperature of the ethylene-alpha-olefin copolymer is 90 ℃, and the extrusion temperature of the polypropylene is 170 ℃;

(2) cutting the composite film obtained in the step (1) to obtain a reflective film with a grid lattice structure;

(3) and (3) compounding the reflective film obtained in the step (2) with a transparent film for 5s at 50 ℃ to obtain the packaging adhesive film.

Example 9

This example provides a packaging adhesive film with a lattice structure and a method for preparing the same, which is different from example 1 only in that the thickness of the adhesive layer 21 is 20 μm, and the other conditions are the same as example 1.

Example 10

This example provides a packaging adhesive film with a lattice structure and a method for preparing the same, which is different from example 1 only in that the thickness of the adhesive layer 21 is 50 μm, and the other conditions are the same as example 1.

Example 11

This example provides a packaging adhesive film with a lattice structure and a method for preparing the same, which is different from example 1 only in that the thickness of the adhesive layer 21 is 15 μm, and the other conditions are the same as example 1.

Example 12

This example provides a packaging adhesive film with a lattice structure and a method for preparing the same, which is different from example 1 only in that the thickness of the adhesive layer 21 is 60 μm, and the other conditions are the same as example 1.

Example 13

This example provides a packaging adhesive film with a lattice structure and a method for preparing the same, which is different from example 1 only in that the thickness of the supporting layer 22 is 35 μm, and the other conditions are the same as example 1.

Example 14

This example provides a packaging adhesive film with a lattice structure and a method for preparing the same, which is different from example 1 only in that the thickness of the supporting layer 22 is 50 μm, and the other conditions are the same as example 1.

Example 15

This example provides a packaging adhesive film with a lattice structure and a method for preparing the same, which is different from example 1 only in that the thickness of the supporting layer 22 is 15 μm, and the other conditions are the same as example 1.

Example 16

This example provides a packaging adhesive film with a lattice structure and a method for preparing the same, which is different from example 1 only in that the thickness of the supporting layer 22 is 60 μm, and the other conditions are the same as example 1.

Comparative example 1

This comparative example provides an encapsulant film and a method for preparing the same, which are different from those of example 1 only in that the composite film obtained in step (2) is directly laminated with a transparent film without cutting, and other conditions are the same as those of example 1.

Comparative example 2

This comparative example provides an adhesive packaging film having a lattice structure, which is different from example 1 only in that the adhesive layer 21 is not included in the adhesive packaging film, the thickness of the support layer 22 is 50 μm, and other conditions are the same as example 1.

Comparative example 3

This comparative example provides a packaging adhesive film having a lattice structure, which is different from example 1 only in that the supporting layer 22 is not included in the packaging adhesive film, the thickness of the adhesive layer 21 is 50 μm, and other conditions are the same as example 1.

The performance of the packaging adhesive film with the lattice structure provided in the above examples and comparative examples was tested according to the following test standards:

appearance: sequentially laminating glass, a first packaging adhesive film, a battery piece layer, a second packaging adhesive film and a back plate according to a photovoltaic module structure, wherein the second packaging adhesive film is provided by the embodiment and the comparative example, then placing the photovoltaic module into a Homohoning semi-automatic laminating machine to prepare the photovoltaic module through a laminating process, the laminating temperature is 140 ℃, the laminating time is 20min, so as to obtain the photovoltaic module, and then, in a room, under the condition that the illumination is not lower than 1000Lx, checking whether the appearance of the second packaging adhesive film in the photovoltaic module is good, and whether deformation or slippage of the battery piece occurs;

reflectance ratio: GB/T2410 & lt 1980 & gt test method for light transmittance and haze of transparent plastics;

photovoltaic module generated power gain: the generated power was tested according to IEC 61215 for the encapsulation films prepared in the application examples and comparative application examples.

The results of the above performance tests are shown in table 1:

TABLE 1

The results in table 1 show that the packaging adhesive film with the lattice structure provided by the invention has a high light reflectivity of 80-94%, can effectively reflect light leakage between the cells, improves the light utilization rate of the photovoltaic module, and has a power generation gain of 0.51-1.22%; the invention makes the packaging adhesive film convenient to prepare and has good appearance structure by designing the components of the bonding layer and the supporting layer, and meanwhile, when the photovoltaic module is prepared, the cell can be bonded, the problems of cell doubling and the like caused by the slippage of the cell are prevented, and the deformation is not easy to generate.

Compared with the example 1, if the thickness of the adhesive layer in the packaging adhesive film is smaller (example 11), the prepared packaging adhesive film has insufficient adhesion with the cell, and the cell can move to cause the cell to generate fragments when the photovoltaic module is prepared; if the thickness of the adhesive layer in the packaging adhesive film is large (example 12), the prepared reflective strip of the packaging adhesive film is too protruding, and the cell is easy to break and generate fragments in the process of preparing the photovoltaic module; if the thickness of the supporting layer in the packaging adhesive film is small (example 15), the prepared packaging adhesive film is easy to deform and wrinkle when used for preparing a photovoltaic module; if the thickness of the supporting layer in the encapsulation adhesive film is larger (example 16), the prepared reflective strip of the encapsulation adhesive film is too protruded, and the cell is easily broken and fragments are generated in the process of preparing the photovoltaic module. Therefore, when the thickness of the bonding layer or the supporting layer is smaller or larger, the prepared packaging adhesive film can cause the cell piece to be cracked or the packaging adhesive film per se to be wrinkled when the prepared packaging adhesive film is used for preparing a photovoltaic module, and the use requirement is not met.

Compared with the example 1, if the packaging adhesive film does not have the lattice structure (the comparative example 1), the photovoltaic module has a lower generated power gain of 0.05 percent although the packaging adhesive film has higher light reflectivity; if the packaging adhesive film does not contain the bonding layer (comparative example 2), the prepared packaging adhesive film can cause the problem of cell piece combination and damage the overall structure of the cell piece because no bonding layer can generate bonding effect on the cell piece when the photovoltaic module is prepared; if the packaging adhesive film does not contain a supporting layer (comparative example 3), the prepared packaging adhesive film can deform when in use, so that the generated power gain of the photovoltaic module is reduced by 0.15%. Therefore, the packaging adhesive film with the lattice structure can effectively improve the power generation gain of the photovoltaic module; the bonding layer in the packaging adhesive film can stick the battery piece to prevent the battery piece from slipping in the process of preparing the photovoltaic module by the laminating process; the supporting layer in the packaging adhesive film can effectively prevent the packaging adhesive film from deforming.

In conclusion, the packaging adhesive film with the lattice structure provided by the invention has higher light reflectivity, can effectively reflect light leakage among the battery pieces, and improves the light utilization rate of the photovoltaic module; the invention makes the packaging adhesive film convenient to prepare and has good appearance structure by designing the components of the bonding layer and the supporting layer, and meanwhile, when the photovoltaic module is prepared, the cell can be bonded, the problems of cell doubling and the like caused by the slippage of the cell are prevented, and the deformation is not easy to generate.

The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.

Claims

1. The packaging adhesive film with the lattice structure is characterized by comprising a transparent adhesive film layer and a reflective film layer, wherein the transparent adhesive film layer and the reflective film layer are arranged in a stacked mode;

the reflective film layer comprises a bonding layer and a supporting layer;

2. The packaging adhesive film according to claim 1, wherein the material of the transparent adhesive film layer is selected from any one or a combination of at least two of ethylene-vinyl acetate copolymer, ethylene-alpha-olefin copolymer, ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, ethylene-methyl methacrylate copolymer, ethyl-methacrylate copolymer, ethylene-butyl acrylate copolymer, polyvinyl butyral, ionomer or polyurethane;

preferably, the bonding layer comprises a first substrate;

preferably, the melting temperature of the first matrix is 60-240 ℃;

preferably, the first matrix is selected from any one of polyethylene, ethylene-alpha-olefin copolymer, ethylene-vinyl acetate copolymer, ethylene-acrylic acid copolymer, ethylene-ethyl acrylate copolymer, ethylene-methyl methacrylate copolymer, ethyl-methacrylate copolymer, ethylene-butyl acrylate copolymer, nylon or ionic polymer or a combination of at least two of the foregoing;

preferably, the weight part of the first matrix in the bonding layer is 50-100 parts;

preferably, the adhesive layer further comprises a tackifying resin;

preferably, the tackifying resin is selected from any one of rosin compounds, alpha-terpene resins, beta-terpene resins, terpene phenolic resins, petroleum resins, dicyclopentadiene resins, coumarone-indene resins, alkyl phenolic resins or xylene resins or a combination of at least two thereof;

preferably, the rosin compound comprises any one or a combination of at least two of gum rosin, wood rosin, hydrogenated rosin, polymerized rosin, esterified rosin resin and maleic rosin;

preferably, the weight part of the tackifying resin in the bonding layer is 0.5-50 parts;

preferably, the adhesive layer further comprises a filler;

preferably, the filler is selected from any one or a combination of at least two of titanium dioxide, silicon dioxide, zirconium dioxide, zinc oxide, lithopone, calcium carbonate, barium sulfate, carbon black, chrome yellow, iron red, chromium oxide green or iron blue;

preferably, the weight part of the filler in the bonding layer is 0.1-20 parts.

3. The packaging adhesive film of claim 2, wherein the adhesive layer further comprises an auxiliary agent;

preferably, the weight part of the auxiliary agent in the bonding layer is 0.01-5 parts;

preferably, the auxiliary agent comprises any one or a combination of at least two of a cross-linking agent, an auxiliary cross-linking agent, a silane coupling agent, a light stabilizer, an antioxidant, an ultraviolet light absorber or an anti-PID auxiliary agent;

preferably, the crosslinking agent is selected from any one of tert-butyl peroxy-2-ethylhexyl carbonate, tert-amyl peroxy (2-ethylhexyl) carbonate, 2, 5-dimethyl-2, 5-bis (tert-butylperoxy) hexane, tert-butyl peroxy-3, 5, 5-trimethylhexanoate, bis (4-methylbenzoyl) peroxide, dibenzoyl peroxide, 1-di (tert-butylperoxy) cyclohexane, 2-ethylhexyl tert-butylperoxycarbonate, butyl-4, 4-bis (tert-butylperoxy) valerate, dicumyl peroxide, or 1, 1-bis (tert-butylperoxy) -3,3, 5-trimethylcyclohexane, or a combination of at least two thereof;

preferably, the weight part of the cross-linking agent in the bonding layer is 0.5-1.5 parts;

preferably, the auxiliary crosslinking agent is selected from any one or a combination of at least two of triallyl isocyanurate, triallyl cyanurate, trimethylolpropane triacrylate, ethoxylated trimethylolpropane triacrylate or ethoxylated pentaerythritol tetraacrylate;

preferably, the weight part of the auxiliary crosslinking agent in the bonding layer is 0.5-1.5 parts;

preferably, the silane coupling agent is selected from any one or a combination of at least two of vinyltrimethoxysilane, vinyltriethoxysilane, vinyltris (beta-methoxyethoxy) silane, N- (2-aminoethyl-3-aminopropyl) trimethoxysilane, 3- (2, 3-glycidoxy) propylmethyldiethoxysilane, 3- (methacryloyl chloride) propyltrimethoxysilane, methylaluminoxypropyltrimethoxysilane or gamma-methacryloxypropyltrimethoxysilane;

preferably, the weight part of the silane coupling agent in the bonding layer is 0.1-1 part;

preferably, the light stabilizer is selected from any one or a combination of at least two of carbon black, titanium oxide, phthalocyanine blue, phthalocyanine green, UV-123, UV-292, UV-622, UV-770 or UV-944;

preferably, the weight part of the light stabilizer in the bonding layer is 0.01-0.5 part;

preferably, the antioxidant is selected from any one or a combination of at least two of 2, 6-di-tert-butyl-4-methylphenol, an antioxidant lU1U, an antioxidant 1098, an antioxidant 1010, an antioxidant 1076, an antioxidant MD-1024, an antioxidant MD-697, an antioxidant 1098, an antioxidant 3114, an antioxidant 245, an antioxidant 1520, an antioxidant 1726, an antioxidant 1035, an antioxidant 1135, an antioxidant 5057, an antioxidant 330 or an antioxidant 1790;

preferably, the antioxidant in the adhesive layer is 0.01-0.5 part by weight;

preferably, the ultraviolet light absorber is selected from any one or a combination of at least two of UV-326, UV-327, UV-328, UV-329, UV-360, UV-P, UV-234, UV-1130, UV-384-2, UV-928, UV-400, UV-1577, UV-1164 or UV-531;

preferably, the weight part of the ultraviolet absorber in the bonding layer is 0.01-0.5;

preferably, the anti-PID additive is selected from metal phosphates and/or silica;

preferably, the metal phosphate is selected from zirconium phosphate and/or titanium phosphate;

preferably, the anti-PID auxiliary agent in the bonding layer accounts for 0.1-0.5 part by weight.

4. Packaging adhesive film according to any one of claims 1-3, wherein the support layer comprises a second matrix;

preferably, the melting temperature of the second matrix is 70-300 ℃;

preferably, the second matrix is selected from any one or a combination of at least two of ethylene-vinyl acetate copolymer, ethylene-alpha-olefin copolymer, polypropylene, polyethylene, polyester, nylon-polyolefin graft copolymer, ethylene-propylene copolymer, polyvinylidene fluoride or silicone resin;

preferably, the weight part of the second matrix in the supporting layer is 75-100 parts;

preferably, the support layer further comprises a filler;

preferably, the weight part of the filler in the supporting layer is 0.1-20 parts.

5. The packaging adhesive film of claim 4, wherein the supporting layer further comprises an auxiliary agent;

preferably, the weight part of the auxiliary agent in the supporting layer is 0.01-4.5 parts;

preferably, the crosslinking agent is selected from the group consisting of tert-butyl peroxy-2-ethylhexyl carbonate, tert-amyl peroxy-2-ethylhexyl carbonate, 2, 5-dimethyl-2, 5-bis (tert-butylperoxy) hexane, tert-butyl peroxy-3, 5, 5-trimethylhexanoate, bis (4-methylbenzoyl) peroxide, dibenzoyl peroxide, 1-bis (tert-butylperoxy) cyclohexane, 2-ethylhexyl tert-butylperoxycarbonate, butyl-4, 4-bis (tert-butylperoxy) valerate, dicumyl peroxide, alpha, any one or a combination of at least two of alpha' -bis (tert-butylperoxy) -1, 3-diisopropylbenzene or 1, 1-bis (tert-butylperoxy) -3,3, 5-trimethylcyclohexane;

preferably, the weight part of the cross-linking agent in the supporting layer is 0.1-1 part;

preferably, the weight part of the auxiliary cross-linking agent in the supporting layer is 0.1-1 part;

preferably, the weight part of the silane coupling agent in the supporting layer is 0.1-1 part;

preferably, the weight part of the light stabilizer in the supporting layer is 0.01-0.5 part;

preferably, the antioxidant in the support layer is selected from any one or a combination of at least two of 2, 6-di-tert-butyl-4-methylphenol, antioxidant lU1U, antioxidant 1098, antioxidant 1010, antioxidant 1076, antioxidant MD-1024, antioxidant MD-697, antioxidant 1098, antioxidant 3114, antioxidant 245, antioxidant 1520, antioxidant 1726, antioxidant 1035, antioxidant 1135, antioxidant 5057, antioxidant 330 and antioxidant 1790;

preferably, the antioxidant is 0.01-0.5 part by weight in the support layer;

preferably, the weight part of the ultraviolet absorbent in the supporting layer is 0.01-0.5;

preferably, the weight part of the anti-PID additive in the supporting layer is 0.01-0.5 part.

6. The packaging adhesive film according to any one of claims 1 to 5, wherein the thickness of the transparent adhesive film layer is 200 to 1000 μm;

preferably, the thickness of the bonding layer is 20-50 μm;

preferably, the thickness of the support layer is 20-50 μm.

7. The packaging adhesive film according to any one of claims 1 to 6, wherein the lattice structure of the light-reflecting film layer is a rectangular lattice structure and/or a lattice structure;

preferably, the width of a rectangle in the rectangular lattice structure is 0.3-2 cm;

preferably, the distance between adjacent rectangles in the rectangular lattice structure is 10-30 cm;

preferably, the lattice structure is composed of quadrangular unit cells;

preferably, the width of the quadrilateral unit cell is 10-30 cm;

preferably, the length of the quadrilateral unit cell is 10-30 cm;

preferably, the distance between the adjacent quadrilateral unit cells is 0.3-2 cm.

8. A method for preparing the packaging adhesive film according to any one of claims 1 to 7, comprising the steps of:

9. The preparation method according to claim 8, wherein the compounding method in step (1) is extrusion through a double-layer co-extrusion extruder;

preferably, the extruding temperature of the double-layer co-extrusion extruder is 50-250 ℃;

preferably, the temperature of the compounding in the step (3) is 40-80 ℃;

preferably, the compounding time in the step (3) is 0.1-10 s.

10. Use of an encapsulating film according to any of claims 1 to 7 for a photovoltaic module.